.tree {
  position: relative;
  width: -moz-fit-content; /* older Firefox (known for 52-74) */
  width: fit-content;
  min-width: 100%;
  line-height: 1;
}

.tree:focus {
  outline: none;
}

.tree ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tree ul li {
  display: block;
  box-sizing: border-box;
  padding-top: .25em;
  padding-bottom: .25em;
}

.tree ul li ul {
  margin-top: .25em;
  margin-bottom: -.25em;
  padding-__MSG_@@bidi_start_edge__: 1em;
}

.tree li > div {
  box-sizing: border-box;
  margin: -2px 0;
  border: solid transparent;
  border-width: 2px;
  padding-__MSG_@@bidi_start_edge__: 1em;
  white-space: nowrap;
}

.tree.selectable li > div {
  cursor: cell;
}

.tree.selectable li > div::before {
  position: absolute;
  box-sizing: border-box;
  left: 0;
  right: 0;
  margin-top: -.25em;
  height: 1.5em;
  border: 1px solid transparent;
  border-radius: 2px;
  content: "";
}

.tree.selectable li > div:hover::before {
  border-color: rgba(125, 162, 206, .3);
  background: linear-gradient(rgba(235, 244, 253, .2), rgba(196, 221, 252, .2));
}

.tree a {
  position: relative;
  z-index: 1;
  text-decoration: unset;
  color: unset;
}

.tree a > img {
  display: inline-block;
  margin: 0 .2em;
  border: none;
  width: 1em;
  height: 1em;
}

.tree.keynav a {
  outline: none;
}

.tree [data-type="bookmark"] > div > a {
  color: rgb(32,192,32);
}

.tree [data-type="note"] > div > a {
  color: rgb(80,0,32);
}

.tree [data-type="combine"] > div > a {
  color: blue;
}

.tree [data-type="separator"] > div {
  display: flex;
}

.tree [data-type="separator"] > div > fieldset {
  position: relative;
  z-index: 1;
  flex: 1;
  margin: 0;
  border: none;
  border-top: 1px solid #aaa;
  padding: 0 0 0 1em;
  height: 1em;
  text-indent: 0;
}

.tree [data-type="separator"] > div > fieldset > legend {
  padding: 0;
  height: 1em;
}

.tree [data-marked] > div > a {
  font-weight: bold;
}

.tree.selectable li > div.highlight::before {
  border: 1px solid rgba(125, 162, 206, .7);
  background: linear-gradient(rgba(235, 244, 253, .3), rgba(196, 221, 252, .3));
}

.tree.selectable li > div.anchor::before {
  border: 1px solid rgba(125, 162, 206, .7);
}

.tree.selectable li > div.highlight:hover::before,
.tree.selectable li > div.highlight.anchor::before {
  border: 1px solid rgba(125, 162, 206, .7);
  background: linear-gradient(rgba(235, 244, 253, .5), rgba(196, 221, 252, .5));
}

.tree.moving li.dragged {
  opacity: 0.5;
}

.tree li > div.dragover.above {
  border-top-color: #FF3333;
}

.tree li > div.dragover.below {
  border-bottom-color: #FF3333;
}

.tree li > div.dragover.within {
  border-style: dashed;
  border-color: #FF3333;
}
